Skip to content
doubtly
Sign up
Log in to upvote 0 Log in to downvote
Topic: Centre of mass of two-particle system and rigid body· Rotational Motion

Which of the following statements are correct ?(a) Centre of mass of a body always coincides with the centre of gravity of the body.(b) Centre of mass of a body is the point at which the total gravitational torque on the body is zero.(c) A couple on…

Which of the following statements are correct ?

(a) Centre of mass of a body always coincides with the centre of gravity of the body.

(b) Centre of mass of a body is the point at which the total gravitational torque on the body is zero.

(c) A couple on a body produce both translational and rotational motion in a body.

(d) Mechanical advantage greater than one means that small effort can be used to lift a large load.

1. (a) and (b)

2. (b) and (c)

3. (c) and (d)

4. (b) and (d)

Doubtly Asked NEET UG 2017 Practice test neet Save WhatsApp Report
Sign in to comment

1 answer

Log in to upvote 0 Log in to downvote

Best answer

Answer: 4. (b) and (d)

Key idea: check each statement.

  • (a) False: centre of mass and centre of gravity coincide only in a uniform gravitational field.
  • (b) True: the net gravitational torque about the centre of mass is zero.
  • (c) False: a couple gives rotation only, no net force, so no translation.
  • (d) True: mechanical advantage above 1 means a small effort lifts a big load.

So (b) and (d) are correct.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
Was this answer helpful?
Sign in to comment

Your answer

Log in or create a free account to answer this question.